Please describe the problem:
Firestarter fails to run on Ubuntu 8.04 when the locale is set to Spanish (but the problem can be generalized to any locale other than English).

The problem is in the (generated) file /etc/firestarter/firestarter.sh. The following lines:

IP=`/sbin/ifconfig $IF | grep inet | cut -d : -f 2 | cut -d \\ -f 1`
MASK=`/sbin/ifconfig $IF | grep Mas | cut -d : -f 4`
BCAST=`/sbin/ifconfig $IF |grep Bcast: | cut -d : -f 3 | cut -d \\ -f 1`

fails when the locale is other than English, because they look up several keyword ("Mas", "Bcast:") which doesn't appears in ifconfig in Spanish. Example:

ricardo@kadath:~$ LANG=C ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:18:f3:53:b2:9a
          inet addr:192.168.2.100 Bcast:192.168.2.255 Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:2736 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2634 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:2917432 (2.7 MB) TX bytes:368744 (360.1 KB)
          Interrupt:18 Base address:0xa000

ricardo@kadath:~$ ifconfig eth0
eth0 Link encap:Ethernet direcciónHW 00:18:f3:53:b2:9a
          inet dirección:192.168.2.100 Difusión:192.168.2.255 Máscara:255.255.255.0
          ARRIBA DIFUSIÓN CORRIENDO MULTICAST MTU:1500 Metric:1
          RX packets:2723 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2620 errors:0 dropped:0 overruns:0 carrier:0
          colisiones:0 txqueuelen:1000
          RX bytes:2908959 (2.7 MB) TX bytes:365950 (357.3 KB)
          Interrupción:18 Dirección base: 0xa000

As a workaround, you can hack the /etc/firestarter/firestarter.sh file, replacing the three above lines with the following:

IP=`LANG=C /sbin/ifconfig $IF | grep inet | cut -d : -f 2 | cut -d \\ -f 1`
MASK=`LANG=C /sbin/ifconfig $IF | grep Mas | cut -d : -f 4`
BCAST=`LANG=C /sbin/ifconfig $IF |grep Bcast: | cut -d : -f 3 | cut -d \\ -f 1`

A patch which resolves the issue follows:

--- src/scriptwriter.c.old	2008-04-30 22:42:08.000000000 +0200
+++ src/scriptwriter.c	2008-04-30 22:44:23.000000000 +0200
@@ -88,9 +88,9 @@
 	fprintf (f, "\n# --(Extract Network Information)--\n\n");
 
 	fprintf (f, "# External network interface data\n"
-		    "IP=`/sbin/ifconfig $IF | grep inet | cut -d : -f 2 | cut -d \\  -f 1`\n"
-		    "MASK=`/sbin/ifconfig $IF | grep Mas | cut -d : -f 4`\n"
-		    "BCAST=`/sbin/ifconfig $IF |grep Bcast: | cut -d : -f 3 | cut -d \\  -f 1`\n"
+		    "IP=`LANG=C /sbin/ifconfig $IF | grep inet | cut -d : -f 2 | cut -d \\  -f 1`\n"
+		    "MASK=`LANG=C /sbin/ifconfig $IF | grep Mas | cut -d : -f 4`\n"
+		    "BCAST=`LANG=C /sbin/ifconfig $IF |grep Bcast: | cut -d : -f 3 | cut -d \\  -f 1`\n"
 		    "NET=$IP/$MASK\n\n");
 
 	fprintf (f, "if [ \"$NAT\" = \"on\" ]; then\n"


Steps to reproduce:
1. Use Ubuntu 8.04
2. Set locale to Spanish
3. Install Firestarter and try to run it


Actual results:
Firestarter don't start properly and shows the following error message: "External network device eth0 is not ready. Aborting.."

Expected results:
Firesterter starts properly.

Does this happen every time?
Yes.

Other information:
Originally reported in Launchpad:

https://bugs.edge.launchpad.net/ubuntu/+source/firestarter/+bug/222038